Mozilla Foundation Security Advisory 2008-46

Heap overflow when canceling newsgroup message

Announced

September 25, 2008

Reporter

Georgi Guninski

Impact

Critical

Products

SeaMonkey, Thunderbird

Fixed in

SeaMonkey 1.1.12

Thunderbird 2.0.0.17

Description

Georgi Guninski reported a buffer overflow in the handling of cancelled newsgroup messages. The error was caused by too small a heap buffer being allocated to store message header information. This buffer could be overrun by an attacker using a specially crafted message which could crash the mail reader and potentially be used to run arbitrary code on the victim's computer.